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      <a href="../../index.html">all files</a> / <a href="index.html">components/lazy/</a> listener.js
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import {loadImageAsync} from '@/utils/utils.js'
const imgCache = {}
export default class {
	constructor({el, loading, error, src, elRender, bindType}) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >		this.el = el </span>// 元素
<span class="cstat-no" title="statement not covered" >		this.loading = loading </span>// loading图片地址
<span class="cstat-no" title="statement not covered" >		this.error = error </span>// 加载出错地址
<span class="cstat-no" title="statement not covered" >		this.src = src </span>// 需要加载的图片地址
<span class="cstat-no" title="statement not covered" >		this.naturalHeight = 0</span>
<span class="cstat-no" title="statement not covered" >        this.naturalWidth = 0</span>
<span class="cstat-no" title="statement not covered" >        this.bindType = bindType</span>
<span class="cstat-no" title="statement not covered" >		this.initState()</span>
<span class="cstat-no" title="statement not covered" >		this.elRender = elRender</span>
<span class="cstat-no" title="statement not covered" >        this.render('loading')</span>
	}
	// 根据状态渲染元素
    render(state) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >		this.elRender(this, state)</span>
    }
&nbsp;
    // 异步加载loading图片
    renderLoading(cb) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >		this.state.loading = true</span>
<span class="cstat-no" title="statement not covered" >		loadImageAsync(this.loading, data =&gt; <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" >			this.render('loading')</span>
<span class="cstat-no" title="statement not covered" >			cb()</span>
		}, error =&gt; <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >			if (error) {</span>
<span class="cstat-no" title="statement not covered" >				console.log(error)</span>
			}
<span class="cstat-no" title="statement not covered" >			this.state.error = true</span>
		})
    }
    // 开始加载图片
	load() <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >		if (this.state.loaded || imgCache[this.src]) {</span>
<span class="cstat-no" title="statement not covered" >			return this.render('loaded')</span>
		}
<span class="cstat-no" title="statement not covered" >		this.renderLoading(() =&gt; <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" >			loadImageAsync(</span>
				this.src,
				data =&gt; <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >					this.naturalHeight = data.naturalHeight</span>
<span class="cstat-no" title="statement not covered" >					this.naturalWidth = data.naturalWidth</span>
<span class="cstat-no" title="statement not covered" >					this.state.loaded = true</span>
<span class="cstat-no" title="statement not covered" >					this.state.error = false</span>
<span class="cstat-no" title="statement not covered" >					this.state.loading = false</span>
<span class="cstat-no" title="statement not covered" >					imgCache[this.src] = 1</span>
<span class="cstat-no" title="statement not covered" >					this.render('loaded')</span>
				},
				error =&gt; <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >					if (error) {</span>
<span class="cstat-no" title="statement not covered" >						console.log(error)</span>
					}
<span class="cstat-no" title="statement not covered" >					this.state.error = true</span>
<span class="cstat-no" title="statement not covered" >					this.state.loaded = false</span>
<span class="cstat-no" title="statement not covered" >					this.state.loading = false</span>
<span class="cstat-no" title="statement not covered" >					this.render('error')</span>
				}
			)
		})
	}
	// 得到元素的距离样式
    getRect() <span class="fstat-no" title="function not covered" >{</span>
		// 会造成浏览器重排和重绘
<span class="cstat-no" title="statement not covered" >        this.rect = this.el.getBoundingClientRect()</span>
    }
	// 判断是否元素是否可见
	checkInView() <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >        this.getRect()</span>
<span class="cstat-no" title="statement not covered" >        return (this.rect.top &lt; window.innerHeight &amp;&amp; this.rect.bottom &gt; 0) &amp;&amp;</span>
            (this.rect.left &lt; window.innerWidth &amp;&amp; this.rect.right &gt; 0)
    }
    // 初始化状态
	initState() <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >		this.state = {</span>
			loading: false,
			loaded: false,
			error: false
		}
	}
	// 更新
	update(src) <span class="fstat-no" title="function not covered" >{</span>
		let oldSrc = <span class="cstat-no" title="statement not covered" >this.src</span>
<span class="cstat-no" title="statement not covered" >		if (oldSrc !== src) {</span>
<span class="cstat-no" title="statement not covered" >			this.src = src</span>
<span class="cstat-no" title="statement not covered" >			this.initState()</span>
		}
	}
	// 注销
	destroy() <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >		this.el = null </span>// 元素
<span class="cstat-no" title="statement not covered" >		this.loading = null </span>// loading图片地址
<span class="cstat-no" title="statement not covered" >		this.error = null </span>// 加载出错地址
<span class="cstat-no" title="statement not covered" >		this.src = null </span>// 需要加载的图片地址
<span class="cstat-no" title="statement not covered" >		this.state = null</span>
<span class="cstat-no" title="statement not covered" >		this.elRender = null</span>
	}
}
&nbsp;</pre></td></tr>
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